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阅读下面材料,在空白处填适当的内容(1个单词)或括号内单词的正确形式。

Recently a new type of reusable mask developed by a Ningbo-based company 1.(enter)the market. Unlike surgical masks, this new product, uses a nanomaterial membrane (纳米膜), rather than the 2.(type) melt-blown fabric, to filter (过滤) bacteria and viruses.

Laboratory tests and 3.third party report show that the mask has achieved the same quality standards of the N95 mask, which can filter 95 percent of tiny objects with a diameter of at least 75 nanometers. The masks are also comfortable, easy to breathe 4.. What’s better, depending on the user's setting and wear time, the mask can 5.(use)up to 20 times.

The mask can also resist repeated sterilization (杀菌) with boiling water, disinfectant,6.alcohol, meaning that people only need to change the filter after wearing it for 12 hours and wash it regularly in hot water at a temperature between 56 and 707.(degree) Celsius for long-term use.

The mask is currently divided into two grades 8.(price) at 6 yuan ($0.89) and 9 yuan,9.(respective). Both are equipped with two replaceable filters. Besides, compared with adult masks, the masks made especially for children are 10.(skin-friendly).

高三英语语法填空中等难度题

少年,再来一题如何?
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